4.
Change event, age or sex and click 'Result' for equivalent performance

Age Grading: how it works
Age grading uses tables of "age factors" and "age standards" to put all runners,
regardless of age and sex on a level playing field. In particular, they allow
runners' performances, no matter what their age, to be corrected to what they
would have been achieving in their prime years, and permit valid comparisons to
be made between people of different ages.
>100% = World record level
> 90% = World class
> 80% = National class
> 70% = Regional class
> 0% = An Athlete